«الأمر بالشيء يدل على حسن المأمور به إذا كان الأمر حكيماً»
When the commander is wise, the command signals the legal goodness of what is commanded.
Here goodness (husn) is not merely personal liking; it means a quality making the act legally fitting as a commanded duty.
The book divides this into husn li-nafsih (good in itself) and husn li-ghayrih (good for the sake of something else). The distinction helps explain how an obligation is discharged.